<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>登录</title>
</head>
<body>
<h1>登录</h1>
<form action="http://localhost:8080/Servlet/checkServlet"
      method="post">
    <label>
        user: <input type="text" name="username"><br/><br/>
        <input type="submit" value="登录">
    </label>
</form>
</body>
</html>